sopc won't start, quartus ii 12.1, ubuntu 12.04

Hi

I have quartus ii 12.1 web edition and ubuntu 12.04. When I click the Tools->Sopc Builder I get the splash screen briefly but then nothing, it doesn't start. Same thing when I try it from the command line: ./sopc_builder/bin/sopc_builder. I get the splash screen but then nothing. There are no error messages. If there's a log file I could look through, please let me know. Any ideas?

Thanks...

Mike